turbo question

toothytoothy Band Wagon
in Engine & Drivetrain
so heres what im thinking

z6 + y8 head
stock pistons and rods
block gaurd
vx mani with t25 (2g dsm turbo)
walbro 255
390cc dsm injectors
boost controller set at 4-7 lbs
wideband

all in a wagon still obd0 with resistor pack

now the question is how bad will my afr be if i run it with out a tune for a little bit?

Comments

  • HakosukaHakosuka Wagonist
    I guess you don't need a block guard if you are running around 200-250HP mark, stock pistons and rods probably won't hold more than that is what I heard.
    Also for AFR, almost impossible to predict. You should build it and try it. :)
  • maxfromCOmaxfromCO Band Wagon
    instead of stock rods and pistons just do the cookie cutter vitara build they've been proven to hold 350-400hp numerous times! they sell an eagle rods and vitara pistons with rings and all for like 450 bucks.
  • toothytoothy Band Wagon
    well the block already has the block guard welded in and decked and it comes with the head, and the rest is what i have laying around for the most part
  • bikewrenchbikewrench Wagonist
    Driving without a tune is not a good idea. Don't spend a bunch of money on a swap and turbo and then blow it up cause you wanted to save money on the tune. IMHO the tune is the most important part. It doesn't have to be to expensive, check out pgmfi.org.
  • darktricksterdarktrickster Wagonist
    Without a tune it will fall flat on it's face every time you pass around 1.2 psi. The ecu thinks there is something wrong and cuts out. At least this what Iv'e heard, I've never turbo'd without a tune. At least pick up a missing link to block boost pressure to the map and an adjustable (or 12:1) FPR. That should let you enjoy it without to much risk of popping things. Also, going to need an air/fuel gauge to give you an idea of what your afr looks like in boost. The hardest thing on your motor will be 4th and 5th gear pulls where you will sustain max boost and load for extended periods of time. When I pop something, It's always during those pulls. There's nothing quite like boost in my opinion. I hope you get it put together and can enjoy it!

    Edit: I see you have wideband listed up there. Assuming that's connected to a gauge, disregard my earlier comment about an afr gauge. Also, as long as your rich in boost and running premium gas you should be able to get away with 7 psi all day long.
  • civtec350civtec350 Wagonist
    my old civic used to fall flat on its face at about 12 psi, i never got it tuned at a shop just had a chipped computer
    with an lsvtec turbo basemap, and a street tune from checking plugs. i had a stock bar map sensor, which only reads up to about 11 psi. but like darktrickster says i would at least get the fpr/fmu. i used the missing link and it didnt work for me, but ive seen it work in other cars .
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